- 著者
- Satoru YAJIMA Yuichi TAKASE Akira EJIRI Naoto TSUJII Hibiki YAMAZAKI Charles P. MOELLER Takahiro SHINYA Yuki TAKEI Yoshiyuki TAJIRI Yusuke YOSHIDA Akito SATO Akichika KITAYAMA Naoki MATSUMOTO
- 出版者
- The Japan Society of Plasma Science and Nuclear Fusion Research
- 雑誌
- Plasma and Fusion Research (ISSN:18806821)
- 巻号頁・発行日
- vol.13, pp.3402114, 2018-09-25 (Released:2018-10-17)
- 参考文献数
- 9
- 被引用文献数
- 3 9
In the TST-2 spherical tokamak device, we carried out a fully non-inductive current startup experiment by Landau damping of the Lower Hybrid Wave (LHW). Capacitively Coupled Combline Antennas (CCCAs) were used for wave injection. The antennas are located on the outboard side and the top side of the vacuum vessel, and by reversing the toroidal magnetic field, it is possible to simulate the case of wave injection from the bottom side. The highest plasma current of 26.7 kA was achieved by top injection with the reversed toroidal magnetic field. According to numerical calculation using ray tracing and Fokker-Planck codes (GENRAY/CQL3D), the downshift of the parallel wavenumber helped the tail of the electron velocity distribution extend to higher energy than the other cases. Additionally, in order to evaluate the directionality of the wavenumber spectrum which is also important for efficient current drive, a finite element solver (COMSOL) was used. In order to avoid deterioration of the wavenumber spectrum, one limiter of the outboard antenna should be moved away toroidally by 70 mm from the current position, and the preferred distance between the antenna and the cutoff density layer is about 2 cm.
- 著者
- Noriko Akazawa Yuki Takei Mitsugu Suzuki Yasuichi Nakayama Hiroyasu Kakuda
- 出版者
- Information Processing Society of Japan (情報処理学会)
- 雑誌
- Journal of Information Processing (ISSN:18826652)
- 巻号頁・発行日
- vol.22, no.4, pp.574-582, 2014-10-15
- 被引用文献数
- 3
The important roles of after school care programs are protecting the lives of students whose parents are working or unable to be at home after they finish school or on school holidays and helping them create self independence. We propose a learning support system for helping after school care students. The system is used for practicing the “Kuku” multiplication table and it has been implemented using the Kinect motion capture system to recognize “air characters” written by the body actions of learners. We conducted a trial to evaluate the proposed system by asking many students in after school care programs to participate and confirmed that this system was helpful for groups of students to learn. We explain here how we implemented the system, and report the results from the trial. We also suggest the future directions of the system.